Basculin is a fish-like Pokémon. In its red form, two parts of its body are separated by a bright red-orange stripe and has spiky white fins. Its blue form, however, will replace the red-orange stripe with a blue one, and its fins and eyes have a sleeker design.
Its name is probably a combination of Bass and Masculin.
Basculin was first shown within footage from the Pokémon Searcher BW tour on August 7, 2010. It was used by Cheren in the demo. It was officially revealed on the October issue of Coro Coro on September 11, 2010.
While most Pokémon can have up to 3 abilities legitimately (two primary abilities and a hidden ability), Basculin can legitimately have four, as an NPC in Driftveil City in Pokémon White trades away a Blue-Striped Basculin with the ability Rock Head.